Flashcards in Pump Ops Chpt 5 Deck (69)
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1
Below 32 degrees water is converted to a solid state of matter called
Ice
2
For fire protection purposes ordinary fresh water is considered to weigh _____ or _____ a gal
62.4 lb/ft or 8.3lb/gal
3
Water may also used to smother fires in combustible liquids whose specific gravity is higher than ____
1
4
In this manual pressure is defined as _________.
Force per unit area
5
Pressure is easily confused with _______. _________ is a simple measure of weight and is expressed in pounds or kilograms
Force
6
The height required for a 1 square inch column of water to produce 1 psi at its base equals 1 foot divided by ________.
0.434 psi/ft or 2.304 feet
7
Therefore a column of water 2.304 feet high exerts pressure of _______ psi at its base.
1
8
In metrics a cube that is 0.1 m x 0.1 m x 0.1 m x holds _____ liter of water.
1
9
The weight of 1 liter of water is ______ kilogram
1
10
One cubic meter of water holds 1000 liters of water and weighs _________ kg
1000
11
The speed at which a fluids travels through a hose or pipe is determined by the pressure upon the fluid as well as The size of the office through which it is flowing. The speed is often called ______
Velocity
12
Fluid pressure is perpendicular to any surface on which it acts
First principle
13
Fluid pressure at a point in fluid at rest is the same intensity in all directions. This principle is used in hydrostatic testing
Second principle
14
Pressure applied to a confined fluid is transmitted equally in all directions
Third principle
15
The pressure of a liquid in an open vessel is proportional to its depth
Fourth principle
16
The pressure of a liquid in an open vessel is proportional to the density of the liquid
Fifth Principle
17
The pressure of a liquid at the bottom of a vessel is independent of the shape of the vessel.
Sixth principle
18
This pressure is greatest at low altitudes and least at very high altitudes ________ at sea level is 14.7
Atmospheric pressure
19
Any pressure less than atmospheric pressure is called_______, and absolute zero pressure is called a _____.
Vacuum and perfect vacuum
20
In the fire service, _____ refers to the height of a water supply above the discharge orifice
Head
21
To convert head in feet to head pressure, you must divide the number of feet by ______.
2.304
22
The water flow definition of _____ is stored potential energy available to force water through pipes, fittings, hose, and adapters.
Static pressure
23
Is the portion of the total available pressure not used to overcome friction loss or gravity while forcing water through pipes, fittings, hoses, or adapters.
Residual pressure
24
While water is flowing from a discharge opening the forward velocity pressure is considered
Flow pressure
25
Use a pitot tube and gauge to measure the forward velocity of the _______.
Flow pressure
26
Refers to the center line of the pump or the bottom of a static water supply source above or below ground level.
Elevation
27
Is the position of an object in relation to sea level
Altitude
28
When a nozzle is above the level of the pump, there is pressure loss. Conversely when a nozzle is below the pump, there is a pressure gain. The pressure losses or gains due to gravity are called ______.
Elevation pressure
29
Above sea level atmospheric pressure decreases approximately _______ for every 1000 feet.
0.5psi
30
